Command Summary

If the calculator is in degree mode, the r (radian) symbol converts a radian angle to degrees.

Command Syntax

angler

Press:

1. 2nd ANGLE to access the angle menu.
2. 3 to select r, or use arrows and ENTER.

TI-83/84/+/SE

1 byte

{{Template:TI-BASIC:Markup cmd=r}}

Normally, when the calculator is in degree mode, the trigonometric functions only return values calculated in degrees. With the r symbol you can have the angle evaluated as if in radian mode because it converts the angle into degrees.

One full rotation around a circle is 2π radians, which is equal to 360°. To convert an angle in radians to degrees you multiply by 180/π, and to convert from degrees to radians multiply by π/180.

In degree mode:

```sin(π)		\\sine of Pi degrees
.0548036651
sin(π^^r)
0
```

```sin(π)
0
sin(π^^r)
0		\\There's no difference when in radians
```

# Optimization

When you only call the trig function once in a program and want it calculated in radians, instead of changing the mode you can just use ° to save one-byte (the newline from using the command Radian)

```:Radian
:sin(X)
can be
:sin(X^^r)
```

# Related Commands

• ° (degree symbol)